ps audio hca/pca upgrade


I have a ps audio hca/pca combination running Von Schweikert VR4 GenIII speakers. If i want to upgrade, would I be better off with HCPS for the PCA or a mod for the HCA(RAM or ASi)? Looking for increased soundstage and depth. Thanks
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I am happy with mine but I sure would like to hear from people who have the hi current power supply and see what kind of difference it made.
That still leaves me wondering whether I should upgrade the HCA or the PCA, if I can only afford one.